Six blood red orbs over Old Hickory Tn. dam and dissapears north to Kentucky.

While observing the fireworks on the horizon, we noticed 3 blood red orbs at 85 degrees north. The orbs were the size of a golf ball at arms lenth. I determined the altitude at 7000 feet using fireworks as reference point. I determined speed at 3 to 500 m.p.h. using aircraft as a reference since im near Nashville airport approach path. You could see aircraft in the distance diverting south on approach away from the objects to Nashville which is not their normal approach path. Also 5 police boats on Old Hickory lake all shined their spotlights at them with no reflection of spotlights on the objects. 3 more objects appeard moving in the same direction. These objects appeared the same as the other objects which preceeded them. All 6 objects after hovering over Old Hickory dam disappeared north and up towards Kentucky.